NB, I second what DGU put here from RCR articles. My husband spend around 1.5 year on the open with OW1 and everyone around them would say "it is a match made in heaven".
He is been with OW2 for over 3 years, living together for at least 2. From the outside, just like with OW1, it looks solid as a rock. But...It is not. OW1 was very jealous and husband was always going for coffee and talking with other women, OW2 is very controling.
It may take him to be divorced but OW2 will end up showing her true colours. She already have, he just did not notice, so wrap up in his ego he his.
Sometimes good things fall apart so better things can fall together. (Marilyn Monroe)